Refactor embed handling and enhance user experience across components

- Integrated the new `buildEmbedFromPayload` function in Scheduler, Tags, and Welcome components to streamline embed creation and management.
- Updated validation schemas to require embed content checks, ensuring robust data integrity for embeds.
- Enhanced localization files to include new placeholder descriptions and improve user guidance for embed fields.
- Refactored embed parsing logic to utilize the `WelcomeEmbedSchema`, improving consistency and validation across the application.

packages/shared/src/phase2.test.ts

@@ -27,6 +27,19 @@ describe('phase2 helpers', () => {
     expect(result).toBe('Join <#123456789012345678> please');
   });
 
+  it('accepts extended embed fields', async () => {
+    const { WelcomeEmbedSchema, embedHasContent } = await import('./phase2.js');
+    const parsed = WelcomeEmbedSchema.parse({
+      title: 'Hi',
+      authorName: 'Nexumi',
+      imageUrl: 'https://example.com/banner.png',
+      footerText: 'Nexumi',
+      timestamp: true
+    });
+    expect(parsed.authorName).toBe('Nexumi');
+    expect(embedHasContent(parsed)).toBe(true);
+  });
+
   it('detects discord invites', () => {
     expect(isDiscordInvite('join https://discord.gg/test')).toBe(true);
     expect(isDiscordInvite('hello world')).toBe(false);